Railway brake beam



Sept 28, 193?. H. W. EKHQLM 2,094,035

RAILWAY BRAKE BEAM Filed March 5, 1936 Patented sepa as, i937 y y y 2,094,035

RAILWAY BRAKE BEAM Herbert W. Ehholm, Chicago, Ill., assignor to Chicago lRailway Equipment Company, Chicago,

Ell., a corporation of Illinois applicants March 5, rese, serial No.- 67,230

'e chime. (ci. isa-eze) The invention relates to railway rolling stock tween the same and the head is transferred by brake beams of the truss type which include a sleeve it to seat 9 onv the head, which seat compression member, a strut, and a tension memis spaced a substantial distance from nut l l ber extending over the strut and anchored at its and the adjacent threaded portion of tension 5 ends to the ends of the compression member. rod 2. As braking pressure is alternately ap- 5 Usually such beams include brake heads mounted plied and released, there is a tendency for the on the ends of the beam and nuts are threaded on head to move relative to the tension rod and the ends of the tension members to be tightened the arrangement illustrated and described will against the outer faces of the brake heads to permit such movement to take place without conl clamp the heads in place and hold the parts of the centrating the transmission of the force set up l beam in rigid assembly. by such movement to the rod at the base of nut l lThe object of the present invention is to avoid In view of the clearance at the points marked the breaking of the tension member oi such a C, rod 2 and nut'll may shift in sleeve l0, and the beam by transferring the thrust between the nut rod, nut and Sleeve may Shift eS a unit in head and the compression member to the brake head, G but the pressure tending to hold the brake head l5 or other anchorage on the tension member, at a tightly lJ-OOH the Compression member i iS not point spaced from the tensioning device without relieved.

involving a structure which would not be inter- In Figure 4, the shifting or tilting of the tension changeable with ordinary brake heads conformrod I2 and nut I3 relative to the head it is facili- 23 ing to Association of American Railroads standtated by the pressure of an antiufriction bear- 20 ards. ing device l5 between the inner end of sleeve l@ 1n the accompanying drawing which illustrates and the opposing seat ll on the brake head. the invention- Otherwise the parts are constructed and func- Figure 1 is atop view of a truss type brake beam tion similarly to the structure of Figure 3. 25 embodying one form of the invention. Figure 5 illustrates a modication in which the 25 Figure 2isa front view of the same. thrust oi' nut i8 on the tension member l!! is Figure 3 is a horizontal section taken through transferred by the sleeve 2U to the compression one end of the beam approximately on the line member 2i through an intermediate thrust re- 3-3 of Figure 2. ceiving block 22 which receives the end of the s@ Figures e, 5, 6, and 7 correspond substantially compression member and provides a mounting 3G to Figure 3 but illustrate diiierent modifications for the brake head 23 which .may rotate on block oi the invention. 2?? and does not have the function of forming In the brake beam of Figures l, Z, and 3, coma part o the tension rod anchorage on the compression member i is of U cross section, tension pression member. 35 member 2 is a solid round rod, the strut 3 will be Figure G illustrates insertion of a compressible of cast metal and provided with a slot #l and a washer 2li between the base of the tensioning nut fulcrum pin hole 5 for receiving and mounting the 25 and the outer wall 26 of the brake head or usual brake lever (not shown). Brake heads t thrust block. It is to be understood that the will have the usual standard contours for mountinner end of sleeve 2l is seated against a bearing 40 ing brake shoes and each head has a socket on its at the inner side of the head or thrust block siminner face for receiving the compression member ilar to that illustrated in Figures 3, 4, and 5.

i, the socket terminating in an outer wall l which While a portion of the pressure between nut 25 is seated against :ad of the compression mem1 and the thrust block will be transferred directly ber. through washer 263, nevertheless the latter will 45 The inner wal'i oi head is provided with yield under severe stress without concentrating a bearing ii facing towards the outer wall l of bending forces on the tension rod 28 at the point the head and recessed to receive a cylindrical oi application of nut 25. sleeve or collar iti which surrounds the end por- Figure '7 illustrates a modiiication in which the tion of tension member i? and extends from seat brake head 30, or corresponding thrust bloei;

9 through the body of the brake head projecting member, is not provided with a positive bearing outwardly beyond the face of wall the outer for seating the sleeve 3|. The thrust block has end of sleeve ill forming a seat for the nut Il a tapered passageway 32 and the exterior of threaded upon the end of tension rod 2 but held sleeve 3i is similarly tapered so as to seat in pasby sleeve lil against contact with the brake head. sageway 32. Sleeve 3l is split throughout a por- 55 Upon the tightening of nut il, the thrust betion or all of its length, as indicated at 33, and

as it is forced to theleft by tightening nut 3l, the split portions of sleeve ll will tighten on rod 3B, clamping tightly against the rod and functioning as do the other sleeves to transfer the thrust from nut Il to a portion of the brake head or thrust block spaced a substantial distance from the nut. The outer portion of the brake head clears the sleeve and nut, as indicated at C', and hence facilitates the movement of the brake head relative to the outer portion of the tension rod.

All forms of the invention avoid the concentration of transverse forces from the brake head to the rod at the point where the nut engages the rod, thus avoiding the likelihood of the rod breaking at this point.

What is claimed is:

1. In a truss type brake beam, a compression member, a thrust block mounted thereon and having an outwardly facing side, a tension member extending through said block and projecting beyond said side. a tensioning device on said tension member, and means for transferring the thrust from said device to said block at a point on the latter spaced inwardly a substantial distance from said side.

2. In a truss type brake beam, a compression member, a thrust block mounted thereon, a tension member having a portion extending through said block and projecting outwardly therefrom, a tensioning device on the end of said tension member, and a sleeve surroundingsaid portion and transferring thrust from said device to the inner side of said block.

3. In a truss type brake beam, a compression member, a thrust block mounted thereon and extending a substantial distance along said member, a tension member extending through said block vand projecting beyond the outer face thereof, a tensioning device on said tension member, a sleeve surrounding a portion of said tension member adjacent said device and receiving the thrust of said device and transferring said thrust to a portion of said block spaced a substantial distance inwardly of said outer face.

in In a truss type brake beam, a compression member, a thrust block mounted thereon and having on its wall nearer the middle of the beam a bearing facing towards the end of the beam, a tension member extending through said block with the part projecting beyond said bearing provided with a threaded terminal portion and with a substantial unthreaded portion, a nut on said threaded terminal portion, and a member seated at its inner end on said bearing projecting through the wall nearer the end of the beam and at its outer end providing a bearing for said nut.

5. In a truss type brake beam, a compression member, a thrust block mounted thereon and having an outwardly facing bearing, a tension member extending through 4said block and projecting outwardly beyond the same, a tensioning device on the outer portion of said tension member, a member having an anti-friction engagement with said bearing at its inner end and provided at its outer end with a bearing for said tensioning device.

8. In a truss type brake beam, a compression member, a thrust block mounted thereon, a tension member extending through said thrust block, a tensioning device on said tension member, means transferring the thrust from said device to said block at a point on the latter spaced a substantial distance from said device, and a brake head mounted on said block, there being substantial clearance between said head and said device and means.

7. In a truss type brake beam, a compression member, a thrust block mounted thereon and having a passageway through its inner side, said passageway flaring towards the outer side of said block, a tension member extending through said passageway, a tensioning device on said tension member, and means for transferring the thrust from said device to said block comprising a split sleeve with its inner end tapered to correspond to said passageway and gripped between the side of said passageway and said tension member, there being substantial clearance between the outer wall of said block and the corresponding portion of said sleeve and of said tensioning device.

8. In a truss type brake beam, a compression member, a brake head mounted thereon and having outwardly and inwardly facing side walls, a tension member extending through said brake head, a nut threaded onto said tension member, and a sleeve fitting around a substantial end portion of said tension member and transferring the thrust from said nut to an inwardly facing wall of said head spaced a substantial distance from said n ut.

9. In a truss type brake beam, acompression member, a brake head mounted thereon, a tension member extending through said head, a tensioning device on the end of said tension member, a sleeve surrounding the portion of said tension member adjacent said device and having one end seated against said brake head with its other end seating said device, there being clearance between the sides of said sleeve and the adjacent portions of said head toavoid the concentrated application of forces transversely of said tension member from said head to said tension member at the point where said tensioning device engages said tension member.

HERBERT W. EKHOLM. 

